On the Controversy about the Presence of Grain Boundary Sliding in Mg AZ31

Carl Boehlert; Zhe Chen; Iván Gutierrez-Urrutia; Javier Llorca; María Teresa Pérez Prado

doi:10.4028/www.scientific.net/MSF.735.22

Paper Titles

Preface, Committees and Sponsors

Thoughts on Superplasticity in General and on its Role in Earth Deformation
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Development of High-Strain-Rate Superplastic Oxide Ceramics Based on Flow Mechanism
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Grain Boundary Sliding during Low Temperature Creep of Ultrafine and Coarse Grained Aluminum
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On the Controversy about the Presence of Grain Boundary Sliding in Mg AZ31
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Common Mechanism for Superplastic Deformation in Different Classes of Materials
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Slip Induced Strain Rate Sensitivity for Superplastic Material?
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EBSD Study of Microstructural Development during Superplastic-Like Forming
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Characteristics of the GBS – SDC Transition during Bi-Axial Forming of AA5083
p.43

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On the Controversy about the Presence of Grain Boundary Sliding in Mg AZ31

Abstract:

Highly-textured, rolled AZ31 sheet material shows a significant drop in the plastic anisotropy (r-value; r=ew/et) in tension between 25°C and 200°C. This behavior was initially explained as a result of the increased activity of non-basal slip with increased temperature. Other authors suggested, however, that the mechanism responsible for this phenomenon was the activation of grain boundary sliding (GBS). Here, in-situ tensile tests have been carried out in an SEM at various temperatures in order to obtain further evidence of the role of GBS during moderate to high temperature deformation of Mg alloys, which remains highly controversial.